has體現(xiàn)三單,故借助助動詞does
He doesn't have to do his homework at school.He have not do his homework at school ??????????￡?????have/has表示“有”時，或者在現(xiàn)在完成時“have/has+過去分詞”結(jié)構(gòu)中的have/has才是助動詞，其余情況下常作實義動詞，故需要借助助動詞幫助否定。你的這個句子表達(dá)是錯誤的。